var CACHE_NAME = 'youcount-cache-1.0';
var urlsToCache = [
  '/index.html',
  '/images/social.png',
  '/js/script.js'
];
self.addEventListener('install', function (event) {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(function (cache) {
        console.log('Opened cache');
        return cache.addAll(urlsToCache);
      })
  );
});

self.addEventListener('fetch', function (event) {
  event.respondWith(
    caches.match(event.request)
      .then(function (response) {
        if (response) {
          return response;
        }
        return fetch(event.request);
      })
  );
});